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TitleFreeze casted microstructured PVA tissue phantoms using a microfabricatedseed layer
Publication TypeConference Paper
Year of Publication2010
AuthorsDawson, A., and Harris P.D.
Conference NameProceedings - IEEE Ultrasonics Symposium
Date Published2010
KeywordsAnisotropic microstructures, Anisotropy, Attenuation coefficient, Experimental characterization, Fibrous tissue, Freeze Casting, Ice control, Ice nucleation, Microfabricated, Microfabricated wells, Microfabrication, Microstructure, Pore dimensions, PVA, seed layer, SEM image, Tissue, Tissue phantom, Ultrasonics
AbstractImproved microstructured PVA phantoms mimicking fibrous tissue have beendeveloped using a modified freeze casting process. In this work we find that byintroducing an SU-8 layer containing microfabricated wells of dimensions 10-30m, which acts as an ice nucleation seed plate, greater control over the finalsample structural properties can be achieved. SEM images reveal highlyanisotropic microstructures with controllable pore dimensions between 1-40 mdepending on the seed layer used in the freeze casting process. Preliminaryexperimental characterization in the range 20-50 MHz reveals a significantdependence of the attenuation coefficient on sample dimension. © 2010 IEEE.

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